Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	$ 802	$ 837	$ 1,604	$ 1,673
Interest cost on projected benefit obligation	695	597	1,390	1,195
Expected return on plan assets	(1,184)	(1,321)	(2,368)	(2,642)
Amortization of unrecognized prior service credit	(17)	(18)	(33)	(36)
Amortization of unrecognized net actuarial loss	366	188	732	375
Net periodic benefit expense	$ 662	$ 283	$ 1,325	$ 565